fix: solve issues with variant_export_external and re-enable wgs_cnv_export_external

[Nicolai-vKuegelgen]

re-enable wgs_cnv_export_external:

• the 'wgs_cnv_export_external' was removed from the snappy_snake app by accident. I has now been re-added

solve issues with variant_export_external:

• changes in the wrapper for varfish_annotator broke the 'variant_export_external' step, since it also relies on this. The expected log files and output links/files have been updated.

[github-actions]

• Please format your Python code with black: make black
• Please format your Snakemake code with snakefmt: make snakefmt
• Please organize your imports isorts: make isort
• Please ensure that your code passes flake8: make flake8

You can trigger all lints locally by running make lint

[coveralls]

Coverage: 83.422% (-1.2%) from 84.613% when pulling 20a590e on 353-wgs_cnv_export_external-step-was-removed-from-snappy-snale into 5ecad1a on main.

[Nicolai-vKuegelgen]

@holtgrewe I'm not sure what I'd need to do to solve the coverage issue (or if it's even necessary given that this fixes a critical issue).

[holtgrewe]

@Nicolai-vKuegelgen ;-)